64f2199389
As charges now pin the css explicitely, there is no more need for kmemcg to acquire a proxy reference for outstanding pages during offlining, or maintain state to identify such "dead" groups. This was the last user of the uncharge functions' return values, so remove them as well. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Vladimir Davydov <vdavydov@parallels.com> Acked-by: Michal Hocko <mhocko@suse.cz> Cc: David Rientjes <rientjes@google.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
#ifndef _LINUX_PAGE_COUNTER_H
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#define _LINUX_PAGE_COUNTER_H
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#include <linux/atomic.h>
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#include <linux/kernel.h>
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#include <asm/page.h>
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struct page_counter {
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atomic_long_t count;
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unsigned long limit;
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struct page_counter *parent;
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/* legacy */
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unsigned long watermark;
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unsigned long failcnt;
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};
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#if BITS_PER_LONG == 32
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#define PAGE_COUNTER_MAX LONG_MAX
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#else
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#define PAGE_COUNTER_MAX (LONG_MAX / PAGE_SIZE)
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#endif
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static inline void page_counter_init(struct page_counter *counter,
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struct page_counter *parent)
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{
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atomic_long_set(&counter->count, 0);
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counter->limit = PAGE_COUNTER_MAX;
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counter->parent = parent;
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}
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static inline unsigned long page_counter_read(struct page_counter *counter)
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{
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return atomic_long_read(&counter->count);
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}
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void page_counter_cancel(struct page_counter *counter, unsigned long nr_pages);
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void page_counter_charge(struct page_counter *counter, unsigned long nr_pages);
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int page_counter_try_charge(struct page_counter *counter,
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unsigned long nr_pages,
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struct page_counter **fail);
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void page_counter_uncharge(struct page_counter *counter, unsigned long nr_pages);
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int page_counter_limit(struct page_counter *counter, unsigned long limit);
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int page_counter_memparse(const char *buf, unsigned long *nr_pages);
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static inline void page_counter_reset_watermark(struct page_counter *counter)
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{
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counter->watermark = page_counter_read(counter);
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}
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#endif /* _LINUX_PAGE_COUNTER_H */
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